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AISI 4130 Steel Hollow Bar

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AISI 4130 Steel Hollow Bar2026-04-28T07:58:19+00:00

Project Description

AISI 4130 Alloy Steel

AISI 4130 is a premium low-alloy CrMo steel renowned for its exceptional strength-to-weight ratio, superior weldability, and excellent machinability. The precise additions of Chromium and Molybdenum significantly enhance the material's hardenability and high-temperature strength. As a trusted manufacturer supplying the world’s top 10 oilfield service companies, ShunFu Metal specializes in engineering this grade specifically for demanding oil, gas, and mining environments. Backed by our API Q1 and ISO 9001 certifications, and with extensive experience exporting to over 50 countries, we possess the proven metallurgical expertise and certified production capabilities to deliver AISI 4130 materials that consistently meet the most critical industry requirements.

AISI 4130 alloy steel hollow bar manufactured by ShunFu Metal for oilfield drilling and wellhead applications
AISI 4130 alloy steel hollow bar — product of ShunFu Metal

Equivalent Grades

International equivalent grades for AISI 4130 alloy steel
US / ASTM DIN / EN GB JIS
AISI 4130 / UNS G41300 1.7218 / 25CrMo4 30CrMo SCM430

Applications

Wellhead Components & Blow-out Preventers (BOPs)

Supplied by ShunFu Metal as heavy forged round bars, fully heat-treated in our API-calibrated furnaces to guarantee compliance with stringent API 6A pressure and toughness requirements.

Drill Collar Blanks & Downhole Tools

Delivered as precision-machined hollow bars, utilizing ShunFu Metal's in-house BTA deep hole drilling and CNC machining capabilities. Our drill collar blanks are ready for immediate integration into your drilling string assemblies.

Valve Body Forgings

Provided as custom-forged blocks or rounds with certified mechanical properties, ensuring reliable, leak-free performance in high-pressure and sour service (NACE MR0175) environments.

Specifications & Standards

  • ASTM A29 / A29M: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought
  • ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
  • API 6A: Specification for Wellhead and Tree Equipment
  • NACE MR0175 / ISO 15156: Materials for use in H₂S-containing environments
  • SAE J404: Chemical Compositions of SAE Alloy Steels
  • ASTM A388: Standard Practice for Ultrasonic Examination of Steel Forgings

ShunFu Metal strictly organizes all manufacturing processes according to these international standards and can provide comprehensive Material Test Certificates (MTC) tailored to your specific project requirements.

Available Sizes & Delivery

ShunFu Metal supplies rolled/forged round bars, flat bars, and hollow bars, supported by API-calibrated heat treatment and BTA/CNC machining.

Delivery: Ready stock (1pc MOQ, 7 days); custom forgings (3 tons MOQ, 30 days); special melts via 3–5T induction or 30–60T EAF for flexible, fast delivery.

Chemical Composition

Chemical composition requirements for AISI 4130 (weight %)
Element Minimum (%) Maximum (%)
Carbon (C)0.280.33
Chromium (Cr)0.801.10
Manganese (Mn)0.400.60
Molybdenum (Mo)0.150.25
Silicon (Si)0.150.35
Phosphorus (P)-0.035
Sulfur (S)-0.040

ShunFu Metal strictly verifies every melt using advanced in-house spectrometry, ensuring all elemental compositions perfectly align with standard specifications before pouring.

Melting & Processing

ShunFu Metal offers standard EAF + LF + VD melting, with optional ESR/PESR or VIM + VAR routes. Customers can negotiate custom metallurgical solutions tailored to specific application demands.

Mechanical Properties

Typical mechanical properties of AISI 4130 in heat-treated condition
Property Minimum Maximum
0.2% Yield Strength75 ksi (517 MPa)-
Ultimate Tensile Strength95 ksi (655 MPa)-
Elongation18%-
Reduction of Area35%-
Hardness (HRC)1822
Hardness (HBW)217237
Charpy V-Notch @ 23°C100 J (Avg) / 80 J (Min Single)-
Charpy V-Notch @ -60°C27 J (Avg) / 20 J (Min Single)-
Charpy V-Notch @ -75°C19 J (Avg)-

ShunFu Metal provides comprehensive mechanical testing reports from accredited laboratories prior to delivery, ensuring all yield, tensile, and impact data is fully traceable to the specific heat and batch.

Heat Treatment

Heat treatment procedures for AISI 4130 at ShunFu Metal
Process Description
QTC ProcedureQuench, Temper, and Control procedure compliant with API 6A specifications
QuenchingControlled cooling to achieve desired martensitic/bainitic structure
TemperingPrecision heating to achieve 75ksi yield and max 22 HRC (NACE compliant)

ShunFu Metal’s heat treatment furnaces are strictly calibrated and maintained in accordance with API standards. This guarantees exceptional temperature uniformity and process repeatability, ensuring our QTC procedures consistently achieve the precise mechanical properties required for AISI 4130.

Surface Finish & Machining

ShunFu Metal’s factory-direct precision equipment—including CNC lathes, milling, and BTA boring—delivers turning, grinding, and deep-hole drilling with tight dimensional tolerances and specific Ra surface roughness values tailored to your needs.

Quality Assurance & Inspection

Holding API Q1 and ISO 9001 certifications, ShunFu Metal conducts rigorous UT (ASTM A388), chemical, and mechanical inspections. We provide EN 10204 3.1 certificates, with 3.2/SGS/TÜV third-party inspections available.

Packing & Shipping

ShunFu Metal leverages experience exporting to 50+ countries to ensure secure transit. Black surface products are tightly wire-bundled, while precision-machined items receive heavy anti-rust oil and multi-layer protective wrapping to preserve dimensional integrity and surface finish, fully complying with any destination port's requirements.

Frequently Asked Questions

Can ShunFu Metal supply AISI 4130 to API 6A and NACE MR0175 specifications?

Yes. As an API Q1 certified manufacturer, ShunFu Metal utilizes API-calibrated furnaces for our QTC process, ensuring full compliance with API 6A and NACE MR0175 for sour service environments.

What is the minimum order quantity for custom AISI 4130 forgings?

For custom forgings, our MOQ is typically 3 tons with a 30-day lead time. ShunFu Metal's flexible production lines include 3–5 ton induction furnaces for smaller specialized batches and 30–60 ton EAFs for large-scale orders.

Do you offer pre-machined AISI 4130 components?

Absolutely. ShunFu Metal is equipped with advanced CNC turning, milling, and BTA deep hole drilling machinery, allowing us to deliver semi-finished or fully machined parts with tight tolerances directly from our factory.

What are the delivery times for AISI 4130 products?

Ready stock ships in 7 days (1 piece MOQ). Custom forgings require a 3 ton MOQ and 30 days lead time. Special melts via induction or EAF routes can be arranged for flexible, faster delivery.

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